Scroll-sawing machine



\ (No Mode'l.) i i 2 Sheezs-Y-Sheet 1.

' A. MGRBIGHT.

SGROLL SAWING MACHINE. mm2-.070. Patented Feb-.13,1883.

wweg. f l ed/ N, PETERS, Mmmm. w'aninlcon nc.

(No Model.) 2 Sheets-Sheet 2.

\ A. MpGREIG-HT.

'SCROLL SAWING NIJ/CHINEl Paientedv Feb. 13,1883.

N. Pneus. PM10 mgngmpmr. wnshinm. nc.

UNITED STATES l` PriTiiNru Graine.

ALEXANDER MCCREIGHT, OF TRANQUIVLITY, OHIO.

SCROLL-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent `No. 272,070, dated February 13, 1883.

Application filed January 10, 1882.

To all whom it may concern Beitknownthat [,ALEXANDERMGGREieHT,

of the town of Tranquility, count-y of Adams,

and State of Ohio, have invented certain new and useful Improvements in Sawin g-Machines,

of which the following is a specification.

My invention consists in certain novel appliances and improvements whereby greater speed can be obtained at less expenditure of power than heretofore, and greater accuracy obtained, and a saw with a thinner blade than those employed in the muley saws' can be used; and my invention further consists in certain other improvements for tightening the saw and regulating the same.

Figure l is a front elevation of the saw shown at the end ofits downward stroke. Fig. 2 is a cross-sectional elevation on the line so m, Fig. 1.l Fig. 3 is a cross-sectional elevation on the line y y. Fig. 4 is an enlarged top' view of a portion of my invention.

Similar parts are designated by similar letters.

The frame A may be of any desirable or convenient shape, ,of sufficient size and strength to accommodate the various workin g parts, etc.

The vertical posts B B' are situated on the left-hand half ofthe frame, being at right angles to its bed, and extending above and below the same, passing` through and being firmly fastened to the transverse-beams G C', whichare in` turn irmly fastened to each side of the Y frame A. These posts B Bl are also firmly con-` size and shape as the beam D, and lying immediately underl and fastened to the transverse beams G C', similarly connects the posts near their lower ends. The posts B B thus being rigidly secured by two systems of fastenings at right angles one to the other,all vibration of any kind is eiiectually prevented, and the strain `upon same transferred to and taken up by the heavy frame-work A.

The driving-shaft `lL is journaled in the standard e, and passes through the post B, projecting suiciently beyond the standard e to permit of the attachment of any preferred form of pulley or other device for operating (No model.)

the machine, and also sufficiently beyond the post B to permitrof the attachment of the drivin g-wheel F. The cam Gis also attached to this shaft E, preferably immediately next to the left-hand side ofthe postB. The crankpin f is attached to the face of the wheel F at a distance from its center equal to the half of the stroke or travel of the saw, and works freely in the boxf', to either end of which is attached an end of the iieXible pitmen or pitman-belts, H H.

On the upper end of the post Bris iournaled one end of the shaft J, the opposite end being journaled in the standardj, which is attached to the end of the beam D. This shaft runs parallel to the shaft E, and has attached to it, in line with the crank-pin f, the pulley K, to the periphery of which is fastened the upper end ofthe belt-pitman H.

Next the inner edge of the standardj and on the shaft J is the pulley L, which ts loosely secured to the shaft J, the pawl Zbeing kept in place by the spring Z2. y

On the lower end of post B is journaled the shaft M, which is parallelto the shaft J, and is journaled at :its opposite end in the hanger m, which is attached-to right hand ot' the beam D. The pulley N is rigidly attached to this shaft M in line with the crank-pin fand pulley K, and has attached to it the lower end of the belt-pitman H. There is also rigidly attached to the shaftM, and inline with the pulley L, the pulley O.`

'The sawP is situated relatively to the pulleys O and L, so that when at its upper stroke its lower end is just below the bed of the frame A. It is connected to the pulley L by the beltpitman P and to the pulley() by the belt-pitman P2. To either end of the saw is attached Y the cross-head blocks pp', which respectively IOO- the slide S. The left-hand end of this shaft E, the wheel F is rotated, and by means of the 'pulley-belt pitmen H H' and pulleys K N gives an alternating rotary motion to the shafts M J, which in turn, by .means of the pulleys L 0,'give a reciprocating motion to the saw P. The cam G is so placed upon the shaft E that, operating upon the cam-lever T', it partially rotates the lever-shaft T (just as the downward stroke of the saw is commencing) sufficiently forward to cause the upper end of the cam-lever to force the slide S forward far enough to give thedesired rake to the saw, and just as the saw commences its upward stroke, by the same connecting mechanism, it rotates the lever-shaft backward, throwing its upper end away from and relievingthe slide S. The strain on the saw causes the same to then fall backward suiiciently for the teeth to clear themselves of the wood and permit the sawdust to pass down. The belts H H' are allowed to lap a little on the pulleys K N, so as to take up any inequality in length due to the position of the crank-pin f. When it is desired to tighten or loosen the saw the pnl# ley L is disconnected from its ratchet-fastening and turned forward or backward on the shaft J until the required adjustment is obtained, and is then again connected to its ratchet attachment by means of a bolt or suitable device. In case the lower belt, P2, becomes stretched, or having been broken and mended, or for any other reason becomes too short, the pulley O is disconnected from its ratchet-fastenin g and turned forward or backward on the shaft M until the required adjustment is obtained, and is then again connected to its ratchet attachment by means of a bolt or other suitable device.

The rake of the saw may be regulated by turning the cam-lever T' back or forward upon the lever-shaft T, it being secured from moving during the work by a set-screw or key.

The belts P' P2 may be ot' any flexible material, but are preferably ofleather or rubber. Their mode of connection with the saw is to be made in any suitable manner." A preferred form of connection is shown in the drawings,

. where the belt is formed with or provided with an eye, W, attached to the bearingspp',which latterarepreferablymadeofrawhide. Through the end of this eye is a slot, which latter ree ceives the end of the saw, and a pin, a, passed through the eye W and through the hole in the end of the saw-blade, and fastened from slipping out by a pin or other suitable device securing the saw inv position. Obviously the saw can thus be readily connected to or disconnected from the belt P' or P2.

While the particular means described for causing the bearing-piece S to be advanced and allowing the latter to retrograde are prefer-' ably those shown, obviously many other modes and means for accomplishing they forward and backward movement of said piece may be employed, and these, in connection with said bearing-pieces S, will fall within the scope of'my invention.

The lower bearing, P2, is so fixed as that when the saw is at the top ot' the stroke the perpendicular line of the lower bearing is in advance advancement and retraction of the bearing 8 5 piece P' impartsto the saw a raking motion, which facilitates the cutting process.

One or more of the various features of my invention may be employed without the remainder, and also, when desired, in connection with other devices, and will still then fall with` in the scope of my invention. For example,a mode ofturning the shaftsJMmay be employed different from that shown, but used in conjunction with the other features of my invention.

The advantages of operating a saw by means of said straps Src., as herein described, thereby dispensing with rods, bolts, Sto., and much ot' the weight and customary breakage to which these'latter are liable, are too apparent to require further elaboration.l

The various features which I claim as new and of my invention, and desire to secure by Letters Patent, are as follows:

1. The combination of the saw P, flexible pitmen, fixed saw-bearings S', oscillating sawbearing S, positiveacting lever T for advancing the upper end of the saw and imparting to the latter a raking cutl during its downstroke, and for permitting the upper end of the saw to be retracted and the teeth to clear themselves of the wood as the saw rises, and connecting and operating mechanism,substan tially as and for the purposes specified.y

2. The combination of the saw and flexible pitman P2, and mechanism,substantially as described,for drawing down said strap and allowingitto b e raised,and exiole pitman P', wound around pulley L on shaft J, and the ratchet t l', connected to said shaft and pulley, substantiallyas and for the purposes specified.

3. The saw P, connected to the shafts Land O by the flexible pitmen P' P2, in combina# tion with the wheel F and straps H H', one

IOD

IIO

end of said straps being connected to the shafts J and M, the other ends of said straps being attached to the crank-pin f on the face of the'I crank-wheel F, substantially as and for the purposes specified.

4. The saw P, connectedto the shafts J M by the'flexible pitmen P' P2, and provided with bearing-blocks p 1o', in combination with the fixed bearing or way S and the oscillating bearngor way S, and means, substantially as described, for imparting an oscillating motion to said bearing S, substantiallyas and for the purposes speciied.

5. The saw P, connected to the shafts J M by the flexible pitinen P' P2, said shafts being provided Withv means for imparting to it a reciprocating motion, in combination with the xed bearing S' and oscillating bearing S, and the rock-shaft T, provided with crank-lever T', caused to en gage With the cam G, attached to the shaft E, to impart a rockin g motion to said rock-shaft, substantially as and for the purposes specilied.

6. The combination of the saw, flexible pitinen, xed bearing S', and oscillating bearing S, rock-shaft T, one end of which is bent, substantially as shown, and rests against one side of said oscillating bearing S, the other end of said rock-shaft being provided with a cranklever, T', having a forked extremity, and the 7. The combination of the saw P7 connected to the shaft J by the strap P' and to the shaft M by the strap P2, the xed bearing S', and the oscillating bearing S, in combination with the wheel F and cam G, attached to the driving-shaft E, the connecting straps H H', attached to the driving-shafts J and M and to the crank-pinf on the face of the crank-wbeel F, and the oscillating shaft T, provided with crank-lever T', to engage with the cam G to impart an oscillating motion to said slllaft and to the oscillating bearing S, substantiallyr as and for the purposes specified. r ALEXANDER MCCREIGHT.-

Witnesses:

JOHN J. MoLLoY,

E. R. HILL. 

